Like: bellingcat - the home of online investigations

These are the folks that identified one of the suspects in the attempted Skripal assassinations as a senior GRU officer.

Bellingcat uses open source and social media investigation to investigate a variety of subjects, from Mexican drug lords to conflicts being fought across the world. Bellingcat brings together contributors who specialise in open source and social media investigation, and creates guides and case studies so others may learn to do the same.

It’s a bit sad that there are so few investigative journalists left that we have to rely on teaching amateurs how to do these kind of investigations online. But, all the tools are available so we might as well learn how to use them. This site can teach you how.